The descriptive set theory of C∗^*-algebra invariants

preprint2012arXivOpen access

Abstract

We establish the Borel computability of various C∗^*-algebra invariants, including the Elliott invariant and the Cuntz semigroup. As applications we deduce that AF algebras are classifiable by countable structures, and that a conjecture of Winter and the second author for nuclear separable simple C*-algebras cannot be disproved by appealing to known standard Borel structures on these algebras.

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